Abstract: Water body is incorporated with a medium of water and the aquatic organisms have relatively short life span, and the studies on quantitative aspect of freshwater ecological patterns are relatively few. As a preliminary study, this paper deals with use of fractal theory of nonlinear science to analyze horizontal two dimension spatial pattern of concentration field of typical physicochemical factors in Meiziya Reservoir. Fractal theory is introduced in this paper for comparing and analyzing spatial occupancy potential of concentration and determining which concentration is of steady presence.